.login-box{
	width:700px;
	height:400px;
	position: absolute;
	top:23%;
	left:32%;
}
.login-bg-color{
	background: #000;
	filter:Alpha(opacity=40);/* 只支持IE6、7、8、9 */
	background-color: rgba(0,0,0,0.4);/* IE9、标准浏览器、IE6和部分IE7内核的浏览器(如QQ浏览器)会读懂 */
	*zoom:1; /* 激活IE6、7的haslayout属性，让它读懂Alpha */
}
.admin-main{
	position: absolute;
	top:60px;
	left:0px;
	right:0px;
	bottom: 0px;
}